The relative contributions of traffic and non-traffic sources in ultrafine particle formations in Tehran mega city
Jafarigol F. Yousefi S. Darvishi Omrani A. Rashidi Y. Buonanno G. Stabil L. Sabanov S. Amouei Torkmahalleh M.
December 2024Nature Research
Scientific Reports
2024#14Issue 1
Emissions of ultrafine particles (UFPs; diameter < 100 nm) are strongly associated with traffic-related emissions and are a growing global concern in urban environments. The aim of this study was to investigate the variations of particle number concentration (PNC) with a diameter > 10 nm at nine stations and understand the major sources of UFPs (primary vs. secondary) in Tehran megacity. The study was carried out in Tehran in 2020. NOx and PNC were reported from a total of nine urban site locations in Tehran and BC concentrations were examined at two monitoring stations. Data from all stations showed diurnal changes with peak morning and evening rush hours. The hourly PNC was correlated with NOx. PNCs in Tehran were higher compared to those of many cities reported in the literature. The highest concentrations were at District 19 station (traffic) and the lowest was at Punak station (residential) such that the average PNC varied from 8.4 × 103 to 5.7 × 104 cm−3. In Ray and Sharif stations, the average contributions of primary and secondary sources of PNC were 67 and 33%, respectively. Overall, we conclude that a decrease in primary emission leads to a decrease in the total concentration of aerosols, despite an increase in the formation of new particles by photo nucleation.
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Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana, Kazakhstan
Department of Environmental Technologies, Environmental Sciences Research Institute, Shahid Beheshti University, Tehran, Iran
Independent Researcher, Mazandaran, Sari, 48197, Iran
Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Cassino, Italy
International Laboratory for Air Quality and Health, Queensland University of Technology, Brisbane, Australia
Department of Mining Engineering, School of Mining and Geosciences, Nazarbayev University, Astana, Kazakhstan
Division of Environmental and Occupational Health Sciences, School of Public Health, University of Illinois at Chicago, Chicago, 60612, IL, United States
Department of Chemical and Materials Engineering
Department of Environmental Technologies
Independent Researcher
Department of Civil and Mechanical Engineering
International Laboratory for Air Quality and Health
Department of Mining Engineering
Division of Environmental and Occupational Health Sciences
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